US6501058B2 - Method for controlling defrosting in microwaven oven - Google Patents

Method for controlling defrosting in microwaven oven Download PDF

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Publication number
US6501058B2
US6501058B2 US09/967,988 US96798801A US6501058B2 US 6501058 B2 US6501058 B2 US 6501058B2 US 96798801 A US96798801 A US 96798801A US 6501058 B2 US6501058 B2 US 6501058B2
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item
defrosting
temperature
defrosting period
during
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US09/967,988
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US20020063127A1 (en
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Yu Jin Jung
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LG Electronics Inc
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LG Electronics Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/688—Circuits for monitoring or control for thawing

Definitions

  • the present invention relates to a microwave oven, and more particularly, to a method for controlling defrosting in a microwave oven, in which an actual temperature of a surface of food is detected continuously during defrosting of the food, for controlling a defrosting process.
  • the microwave oven heats food in a cavity by means of an ultra high frequency wave (2450 MHz) from a magnetron.
  • an infrared sensor is fitted on one side of the cavity, for projection to the food, to detect a surface temperature of the surface of the food, and transmission of the information to a microprocessor in the microwave oven, so that the microprocessor can determine heating and control conditions thereafter based on the detected surface temperature of the food.
  • a related art microwave oven is provided with a turntable 11 for placing food to be cooked thereon, a magnetron 12 for generating, and supplying a microwave to the food in the cavity 10 through a waveguide, a cooling fan 13 for cooling the heated magnetron 12 , an infrared sensor 14 for detecting a temperature of the food, and a control part (not shown) for controlling operation of the magnetron 12 .
  • the control part puts the magnetron 12 into operation.
  • a microwave generated at the magnetron 12 is directed to the cavity 10 through the waveguide, and heats the food.
  • the infrared sensor 14 detects a surface temperature of the food, and provides a voltage for a surface temperature of the food, which signal is passed through a series of signal processing, and provided to the control part.
  • the control part operates the magnetron 12 to heat the food until a cooking temperature reaches to a target temperature, and the cooling fan 13 during cooking for cooling the heated magnetron 12 .
  • Positions of the infrared sensor 14 and the cooling fan 13 are not limited to the positions shown in FIG. 1, but may differ depending on types of the microwave oven; different from the positions shown in FIG. 1, the positions may be varied, such that the infrared sensor is fitted to a right side of the cavity, and the cooling fan is fitted to a top of the cavity.
  • FIG. 2 illustrates a graph showing time vs. a temperature variation of frozen food, wherein hatched blocks denote power turned on time periods during which a power is supplied into the cavity 10 as a heating energy. That is, the magnetron is operative in periods shown in hatched blocks to direct the microwave to the frozen food inside of the cavity 10 .
  • the microwave oven is put into operation in a state a surface temperature thereof is below zero, when the infrared sensor 14 at one side of the cavity 10 detects a variation of the surface temperature of the frozen food.
  • the power turned on time period becomes shorter, gradually. That is, because a temperature of the frozen food rises gradually as the defrosting proceeds, the power turned on time periods become the shorter as a frozen food turn over time period ‘P’ approaches.
  • the user opens a door on the microwave oven, turns the frozen food over, and proceeds the defrosting, again.
  • a power turned on time period of the magnetron is controlled at fixed intervals baser on a time period taken from the initial defrosting to the turn over ‘P’, and a power condition until the turn over time period ‘P’ is reached. That is, after the frozen food is turned over, the defrosting is carried out in a certain time period and power, taking a time period taken in a first defrosting of the frozen food (a defrosting process until the turn over) and a power condition in the time period into account. Therefore, in the second defrosting process after the frozen food is turned over, a process proceeds, in which merely the magnetron 12 is turned on/off periodically based on the time period taken in the first defrosting and the power condition in the time period.
  • the related art defrosting in the microwave oven has a problem in that defrosting of frozen food is not made properly in a case frozen states differ on both sides of the frozen food to be defrosted due to shape or other.
  • the defrosting after the frozen food is turned over is carried out regardless of the surface temperature of the turned over frozen food, that causes problems of a product reliability deterioration coming from pre-mature defrosting, or excessive defrosting, or inconvenience to the user.
  • the present invention is directed to a method for controlling defrosting in a microwave oven that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide a method for controlling defrosting in a microwave oven, which can control a second defrosting according to an actual temperature of frozen food.
  • the method for controlling defrosting in a microwave oven having an infrared sensor includes the steps of (a) controlling a first defrosting up to a preset temperature upon reception of defrosting key application from a user, (b) turning over frozen food upon completion of the first defrosting, and (c) periodically detecting a surface temperature of the turned over frozen food by using the infrared sensor, and controlling a second defrosting according to the detected surface temperature and temperature variation.
  • An initial voltage application time period in the step (a) or (c) is made relatively longer than the voltage application time period in a later half of each of the steps.
  • the step (a) includes the steps of calculating a turning over time point by using the presently progressive minimum temperature Min_T and a minimum temperature variation ⁇ T, calculating a first defrosting voltage by using a greater value ⁇ Tmax of the minimum temperature variation ⁇ T and a maximum temperature variation ⁇ Tm, and the presently progressive minimum temperature Min_T, and carrying out defrosting according to the calculation, and generating a signal sound if the minimum temperature Min_T or a maximum temperature Max_T is higher than a preset temperature, or if the turning over time point is over a preset time point.
  • the step (c) includes the steps of calculating a defrosting finish time point and a second defrosting time period upon reception of a starting key again after the frozen food is turned over, calculating a second defrosting voltage by using a smaller temperature variation value ⁇ Tmin, and the presently progressive minimum temperature Min_T upon calculation of the defrosting finish time point and the second defrosting time period, the smaller temperature variation value ⁇ Tmin being selected from the minimum temperature variation ⁇ T and a maximum temperature variation ⁇ Tm obtained based on the surface temperature detection of the frozen food, and finishing defrosting if the minimum temperature Min_T or the maximum temperature Max_T is higher than a preset temperature, the present time point is the same with the calculated finish time point, or the calculated defrosting time period is passed.
  • the voltage application condition control according to the periodic detection of a surface temperature of frozen food by an infrared sensor, not only in the first defrosting when one side of the frozen food is heated, but also in the second defrosting after the turn over of the frozen food permits an optimal defrosting of the frozen food. That is, the defrosting control based on the surface temperature and the temperature variation of the frozen food permits to prevent a pre-mature, or excessive defrosting, and the optimal defrosting made available by the present invention provides a satisfaction and reliability on the product to the user.
  • FIG. 1 illustrates a related art microwave oven
  • FIG. 2 illustrates a graph showing a related art time vs. a temperature variation of frozen food
  • FIGS. 3A and 3B illustrate a flow chart showing a method for controlling defrosting in a microwave oven in accordance with a preferred embodiment of the present invention.
  • FIG. 4 illustrates a graph showing time vs. a temperature variation of frozen food in accordance with a preferred embodiment of the present invention.
  • FIGS. 3A and 3B illustrate a flow chart showing a method for controlling defrosting in a microwave oven in accordance with a preferred embodiment of the present invention
  • FIG. 4 illustrates a graph showing time vs. a temperature variation of frozen food in accordance with a preferred embodiment of the present invention.
  • selection of a defrosting key by the user is determined S 11 .
  • User's pressing of a start button is determined S 12 .
  • a data for an initial 5 seconds is not stored, but lets pass, and 25 temperature data detected from 6th second to 10th second thereafter is stored S 13 .
  • the presently progressive minimum temperature Min_T and minimum temperature variation ⁇ T are detected and applied to the following equation (1), for calculating a turn over point (Detection Point; DP) S 14 .
  • the presently progressive minimum temperature Min_T is defined as a minimum temperature among temperatures read periodically, and the minimum temperature variation ⁇ T is defined as a difference of the present period minimum temperature and the initial minimum temperature.
  • a greater value ⁇ Tmax of a maximum temperature variation ⁇ Tm and a minimum temperature variation ⁇ T, and the presently progressive minimum temperature Min_T are applied to the following equation (2), to calculate a heating voltage in the first defrosting S 15 .
  • the defrosting it is determined that whether the minimum temperature Min_T is higher than a preset temperature 18° C., or the maximum temperature Max_T is higher than 40° C. for two minutes continuously S 16 . As a result of the determination, if the minimum temperature Min_T is higher than the preset temperature 18° C., or the maximum temperature Max_T is higher than 40° C. for two minutes continuously, the defrosting is ended. However, as a result of the determination, if the minimum temperature Min_T is lower than the preset temperature 18° C., or the maximum temperature Max_T fails to be higher than 40° C. for two minutes continuously, the turn over time ‘DP’ is determined of being higher than a preset value 7.5 S 17 .
  • T 1 a time period required before the door is opened.
  • the time period T 1 required before the door is opened is applied to the following equation (4), to calculate a constant K, which is applied to the following equation (5), to calculate a second defrosting time period S 22 .
  • a second defrosting time period T 1 * KT 1 (5),
  • the presently progressive minimum temperature Min_T, and a minimum value ⁇ Tmin of the minimum temperature variation ⁇ T and a maximum temperature variation ⁇ Tm are applied to the following equation (6), to calculate a voltage according to which the second defrosting is controlled S 23 .
  • Second defrosting voltage 5* ⁇ 15*(0.5*Min — T )+(0.5* ⁇ T min) ⁇ (6)
  • the second defrosting it is determined that the minimum temperature Min_T is higher than the preset temperature 18° C., or the maximum temperature Max_T is higher than 40° C. for two seconds continuously S 24 .
  • the determination S 24 if the minimum temperature Min_T is higher than the preset temperature 18° C., or the maximum temperature Max_T is higher than 40° C. for two seconds continuously S 24 , the second defrosting is finished.
  • the minimum temperature Min_T is higher than the preset temperature 18° C., or the maximum temperature Max_T is lower than 40° C.
  • the defrosting finish time point EPF calculated in the step S 21 is determined of being the present time S 25 . Then, as a result of the determination S 25 , if the defrosting finish time point EPF calculated at the step S 21 is not the present time, pass of the second defrosting time period calculated in the step S 22 is determined S 26 . If the defrosting finish time point EPF calculated at the step S 26 is the present time, or the second defrosting time period is passed, the second defrosting is finished.
  • the defrosting is started at the calculated first defrosting voltage, to defrost frozen food of which surface temperature is below zero. Since the frozen food is below zero at an initial defrosting, a defrosting voltage is applied for a relatively long time period based on the temperature of the frozen food. Upon the surface temperature of the frozen food rises, the voltage applying time period becomes shorter, gradually.
  • the frozen food is required to be turned over at a time point when it is determined that the first defrosting is finished as the surface temperature of the frozen food rises a certain temperature through the foregoing steps, of which turning over time DP is determined with reference to the minimum temperature Min_T and a minimum temperature variation ⁇ T.
  • the infrared sensor is used for detecting the surface temperature and the temperature variation of the frozen food, for controlling the second defrosting. That is, since an initial voltage in the second defrosting is fixed based on an actual surface temperature of the frozen food detected by the infrared sensor, the voltage application time period becomes relatively long at an initial stage of the second defrosting. During defrosting the frozen food as the voltage application is kept on, the voltage application time period is made gradually shorter based on the temperature and the temperature variation detected periodically by the infrared sensor. Therefore, the temperature detection of the frozen food by the infrared sensor in the second defrosting is continued periodically until completion of the defrosting.
  • the voltage application after the turn over time point DP is long initially, and becomes shorter gradually, and the on and off of the voltage application is dropping of a power application according to an extent of defrosting of the frozen food by detecting an actual surface temperature of the frozen food by the infrared sensor.
  • the method for controlling defrosting in a microwave oven of the present invention regulates a voltage application condition according to a defrosted level according to the surface temperature of the frozen food detected by the infrared sensor continuously even in the second defrosting after turn over of the frozen food.
  • the method for controlling defrosting in a microwave oven of the present invention has the following advantages.
  • the voltage application condition control according to the periodic detection of a surface temperature of frozen food by an infrared sensor, not only in the first defrosting when one side of the frozen food is heated, but also in the second defrosting after the turn over of the frozen food permits an optimal defrosting of the frozen food. That is, the defrosting control based on the surface temperature and the temperature variation of the frozen food permits to prevent a pre-mature, or excessive defrosting.
  • the optimal defrosting made available by the present invention provides a satisfaction and reliability on the product to the user.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
  • Freezing, Cooling And Drying Of Foods (AREA)
US09/967,988 2000-11-30 2001-10-02 Method for controlling defrosting in microwaven oven Expired - Fee Related US6501058B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2000-0071985A KR100396662B1 (ko) 2000-11-30 2000-11-30 전자레인지의 해동 제어방법
KR2000-71985 2000-11-30
KR00-71985 2000-11-30

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US (1) US6501058B2 (de)
EP (1) EP1211913B1 (de)
KR (1) KR100396662B1 (de)
CN (1) CN1188630C (de)
AT (1) ATE554633T1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030139843A1 (en) * 2001-12-13 2003-07-24 Ziqiang Hu Automated cooking system for food accompanied by machine readable indicia
US20040251249A1 (en) * 2003-06-10 2004-12-16 Head Jesse S. Microwave oven systems and methods
US20050133257A1 (en) * 2003-12-22 2005-06-23 Endicott Interconnect Technologies, Inc. Printed circuit board with low cross-talk noise
US20150305096A1 (en) * 2013-10-24 2015-10-22 Ching-Chuan Lin Method for executing heating according property of food
US20180044621A1 (en) * 2015-02-16 2018-02-15 Smart Spirits, S.L. Infuser for alcoholic beverages
US10009957B2 (en) 2016-03-30 2018-06-26 The Markov Corporation Electronic oven with infrared evaluative control
US11882956B2 (en) 2021-05-28 2024-01-30 Whirlpool Corporation Cooking adjustment system

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CN100343583C (zh) * 2003-02-21 2007-10-17 乐金电子(天津)电器有限公司 微波炉解冻控制方法
US7961663B2 (en) * 2004-04-05 2011-06-14 Daniel J. LIN Peer-to-peer mobile instant messaging method and device
US7810338B2 (en) 2004-07-16 2010-10-12 Siegfried Marx Control method for the air-conditioning treatment of products
DE502005000527D1 (de) * 2005-02-02 2007-05-10 Frima Sa Verfahren und Vorrichtung zum Bestimmen eines Wendezeitpunktes eines Gargutes
CN101940351B (zh) * 2009-07-10 2013-09-25 乐金电子(天津)电器有限公司 微波炉的食物解冻方法
CN102003996A (zh) * 2009-08-29 2011-04-06 乐金电子(天津)电器有限公司 鉴别微波炉上食物的形状、大小、摆放位置及温度的方法
CN104919891B (zh) * 2012-12-27 2018-07-06 皇家飞利浦有限公司 用于确定食物的芯部温度的装置和方法
RU2664766C2 (ru) * 2012-12-27 2018-08-23 Конинклейке Филипс Н.В. Способ и устройство для определения температуры внутри продукта питания
CN104676680B (zh) * 2014-02-14 2018-09-14 广东美的厨房电器制造有限公司 微波炉及用于微波炉的微波解冻方法
CN109990563B (zh) * 2017-12-29 2021-01-01 青岛海尔股份有限公司 风冷冰箱及其控制方法

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Publication number Priority date Publication date Assignee Title
US4171382A (en) * 1977-08-30 1979-10-16 Litton Systems, Inc. Method of cooking meats in a microwave oven
US4705926A (en) * 1984-12-03 1987-11-10 Sanyo Electric Co., Ltd. Electronic control cooking apparatus
EP0746181A1 (de) * 1995-05-31 1996-12-04 Moulinex S.A. Verfahren zum selbsttätigen Auftauen von Lebensmitteln in einem Mikrowellenofen
US6013907A (en) * 1997-06-09 2000-01-11 Lg Electronics Inc. Microwave oven equipped with thermopile sensor and thawing method using the same
US6299920B1 (en) * 1998-11-05 2001-10-09 Premark Feg L.L.C. Systems and method for non-invasive assessment of cooked status of food during cooking
US6198084B1 (en) * 1999-07-12 2001-03-06 Samsung Electronics Co., Ltd. Defrosting method for a microwave oven using an infrared sensor

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030139843A1 (en) * 2001-12-13 2003-07-24 Ziqiang Hu Automated cooking system for food accompanied by machine readable indicia
US6862494B2 (en) * 2001-12-13 2005-03-01 General Electric Company Automated cooking system for food accompanied by machine readable indicia
US20070089290A1 (en) * 2003-01-30 2007-04-26 Endicott Interconnect Technologies, Inc. Method of making a printed circuit board with low cross-talk noise
US7530167B2 (en) 2003-01-30 2009-05-12 Endicott Interconnect Technologies, Inc. Method of making a printed circuit board with low cross-talk noise
US20040251249A1 (en) * 2003-06-10 2004-12-16 Head Jesse S. Microwave oven systems and methods
US6963058B2 (en) 2003-06-10 2005-11-08 General Electric Company Microwave oven systems and methods
US20050133257A1 (en) * 2003-12-22 2005-06-23 Endicott Interconnect Technologies, Inc. Printed circuit board with low cross-talk noise
US7176383B2 (en) 2003-12-22 2007-02-13 Endicott Interconnect Technologies, Inc. Printed circuit board with low cross-talk noise
US20150305096A1 (en) * 2013-10-24 2015-10-22 Ching-Chuan Lin Method for executing heating according property of food
US20180044621A1 (en) * 2015-02-16 2018-02-15 Smart Spirits, S.L. Infuser for alcoholic beverages
US11186808B2 (en) * 2015-02-16 2021-11-30 Smart Spirits, S.L. Infuser for alcoholic beverages
US10009957B2 (en) 2016-03-30 2018-06-26 The Markov Corporation Electronic oven with infrared evaluative control
US10681776B2 (en) 2016-03-30 2020-06-09 Markov Llc Electronic oven with infrared evaluative control
US11632826B2 (en) 2016-03-30 2023-04-18 Markov Llc Electronic oven with infrared evaluative control
US11882956B2 (en) 2021-05-28 2024-01-30 Whirlpool Corporation Cooking adjustment system
US12478208B2 (en) 2021-05-28 2025-11-25 Whirlpool Corporation Cooking adjustment system

Also Published As

Publication number Publication date
EP1211913A3 (de) 2004-04-07
ATE554633T1 (de) 2012-05-15
EP1211913A2 (de) 2002-06-05
KR100396662B1 (ko) 2003-09-02
CN1355401A (zh) 2002-06-26
CN1188630C (zh) 2005-02-09
EP1211913B1 (de) 2012-04-18
KR20020042195A (ko) 2002-06-05
US20020063127A1 (en) 2002-05-30

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